Stapling machine



May 26, 1925. 1,539,505

F. POLZER STAPLING MACHINE Filed May 21, 1924 Patented May 26, 1925.

UNITED STATES g v 1,539,505 PATENT-OFFICE H rRInoLIN POLZER, or NORWALK, CONNECTICUT, essTeNon o THE E. H. HoTCn Iss COMPANY, OF NORWALK, CONNECTICUT, ORLPORATION OF CONNECTICUT. I

sTAPLINe MACHINE.

Application filed May 21, 1924. Serial No. 714,805.

To a]! whom it Ill/.lf/ concern:

Be itknown that I, FRIDOLIN POLZER, a citizen of the United States, residing at Norwalk, county of Fairfield, State of Connecticut, have invented a new and useful stapling Hachine, of which the following is a specification.

This invention relates to stapling machines, especiallyof'the type adapted for use in setting staples to secure tags to boxes and the like. In the usual type of these machines there is a housing in which a plunger is mounted to slide, and the lower end of the plunger is arranged to coact with one end of a staple strip support to sever individual staples from a strip of connected staples and force the staples through the tag into the box to secure it thereto, suitable mechanism being provided which is op erated by movements of the .plungerto ad vance the staple strip with a step by step feeding movement to bring the individual staples into the proper position for severing and driving. At the outer end of the plunger is secured a head or cap to be struck by the hand for operating the plunger and setting the staples. v

It has been found in practice that although this plunger and head was designed to be operated by a blow of the hand, the head being usually rounded and of considerable surface so as not to injure the hand, that where a large number of staples were driven the operator's would'operate the machine to a large extent by hitting the head with a hammer or other instrument, and as they were not particular to hit the head in the center or on the axis of the plunger, but were just as liable to strike it Ofi' center or anywhere on the surface of the head, that a considerable strain was placed on the connection between the head and the plunger which soon separated the head from the plunger.

It is, therefore. an object of the present invention to provide means for absorbing a large portion of the force of this blow, especially one on the side of the head to prevent the breaking of the connection between the head and plunger.

It is also an object of the invention to provide an improved stop for limiting the movement of the plunger, which will equalize and distribute the force of this blow, or the pressure on the head, throughout the under sid of the head, and relieve the connection between the'head'andthe plunger of the necessity of absorbing the force of the blow or pressure. V

lVith the foregoing'and other objects in view, I have devised the construction illustrated in the accompanying drawing forming a part of this specification, similar reference characters being employed throughout the various figures to indicate the cor responding elements. In this drawing,

Fig. 1 is a side elevation of the stapling machine in position for operation; the. stop being shown in section and a. portion of the housing being broken away to more clearly f show the construction. I

Fig. 2 is a front elevation'loOking from the left of Fig. 1.

F ig.. 3 is. a vertical section through the head and the stop means. showing the plunger in its lowest position.

Fig. 4 is a section through the head showing the construction thereof.

In the drawing,10 indicates in outline a portion of a box or other article towhich the tag 11 is to be attached. Resting on this tag is shown the stapling machine comprising a housing 12 in which the various meclr. anisms are mounted for severing and driving the individual staples. This housing includes the usual handle 13 for holding in proper position. At the'forward end ofthe housing are upright guide waysxlt for the plunger 15, the lower end of which coacts with the forward end of the slide-16 for supporting and guiding the usual strip -of staples, not shown, to cut the individual staples-from the strip, and then'drive the severed staple. The'plunger'also has a laterally projecting lug 17 which engages a screw or rivet 18 to limit the upward movement of the plunger, and this lug is adapted to engage a finger 19 ,for Operating the usual staple strip'feedin g mechanism, which is not shown, as it may be of any of the usual or desired constructionsand forms no part of my present invention. I have also shown a staple straightening and holding device 20 which has two fingers 21 on opposite sides of the lug 17, which device moves with the plunger throughout part of its journey and passes between the prongs of the first and second staples on the strip to straighten the first staple on the strip should it be bent, or to hold the staple against turning during the severing operation. This device may or may not be employed, as desired. At its upper end this staple straightening and holding device has laterally projecting lugs 22 engaged 'on their under side bythe upper end by a spring 23 embracing the plunger,- and between the upper sides of theselugs and the under side of the cap or head 24 is a second spring 25 which is stronger than the lower spring 23, so that when the cap and plungeris depressed the holding o de vice 20 movesdownwardlylwith theplunger;

until the lower ends of the fingers 19 engage the top of the tag 11, when the movement over the end of the plunger or by welding,

' preferably an inverted cup member of sheet; metal spun over at its lower edge about 80.

and is enclosed by a finishing member 29,

the edge ofthe inner member to secure it in position. This-cap or operating head is preferably madeof inverted cup shape as shown with a roundedupper surface to give a considerable surface to receivethe blow, of the-hand 1n operatlonso as not to 1n ure 4 the hand, but it may, of course, be made of S any shape found desirable or practical;

As pointed out above it has been found= in practice that these devices are operated by hitting the top of thevhead with a hammer or other instrument, and. itwill be-obvious that unless this blow is in the center of the top'or along the axis of the. plunger therelwillg be a great tendency to turn the head on the. plunger and break its connec tion with the plunger. To'prevent the separation ofthehead from the plunger I provide a simple supporting member and stop betweenthe head and the housing. ,In Figs.

1, 2 and3 this stop and support comprises a cup member-31 embracing the plunger and l bearing on the inner wallet the cup. The

side walls of this "cup are substantially cylindrical leaving an annular upper end 33 which forms a seat for the head when the plunger, is 111, its lower pos tion, as shown in Fig.3. It also provides stop to-limit the downward movement of the head andplun ger; .It will alsobe noted thatthe'spring V 23. tends to hold-this member against the housing and at the same time tends to move theplunger to itsupper position'f In this form of devicetherelis. an opening 34 in'the bottom of the cup for passageof the plun ger and through which; the plunger slides. I prefer instead t relying on the tag 11 asthe means 01; stoppingthe movement of the straightening device, toso proportion the elements that'the-movement of the straightening, device willjbe stoppedfat the proper time. by engagement of ,lugs :22 with the inner curved. wall38, seine upper en d of-the stop member 31'.

Having thuslset, invention; what .I claimis: i e e y In a stapling machine, a housing, a plum ger forpdriving the individual staples slidably mountedjin said housing, I a concavoconvex cap for direct manual operation; se-

cured to the upper end ofthe plunger for operating said plunger, a spring'embracing, the plunger andtending to move it to itsup-- per position,.and an independent cup'shaped; member having an opening in its bottom.

wall for passage of the plungerand tubular side walls to embrace saidspringthe lower end of said cup being arrangedto engage w the housing and the .upper end arranged to;

engage the under side ofithe cap at a sub.

stantialdistance fromitspenter to limit the movementotthe plunger; and support the capjtoprevent breaking of the connection between the .cap and plunger.

In testimony whereof I afiix my signature;

5 1 I FRIDOLIN 'POLZER.

forth lthejnature of my. 

